ASP: how to get a file extension

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While we have already seen how to upload files and how to work with the Scripting.FileSystemObject, today we are going to see how to get a file extension, for example before authorising a user to upload a file to our server. We all know very well how important is security when working with the file system objects: for example, we don't want the user to upload executable, or other potentially malicious files on our server.
Said that, we can create a short ASP function to check the file extension, and grant or deny the upload.
Let's see how...

jQuery: 5 useful file upload plugins

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Following my "ASP: Scripting.FileSystemObject... how to move, copy and delete a file or a folder" post I think that implementing a file management system for example on an Intranet, could be interesting indeed. In the mentioned post, I explained how to manipulate files already uploaded on the server. Now you could ask how to develop an upload system... so here we are.